2021 Day 8 Complete!

2021-12-08 09:14:01 -06:00 · 2021-12-08 09:14:01 -06:00 · 3938ed03b1
commit 3938ed03b1
parent 5b7a73e883
3 changed files with 484 additions and 0 deletions
--- a/2021/day08/input
+++ b/2021/day08/input
@ -0,0 +1,200 @@
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+agdcef fdaeg fbcdaeg cbgdae afgbd fea cfde eagcfb gdace ef | bgecda afe defc daegf
+dcaegbf fdgeba ad dbafe defbc faebg dacfbg daf egda cfaegb | abedf bfdaeg dbfgea cfagbed
+geb bgafecd bcae fgabce aefcg be gadfec gfebc bgdfc gbfeda | ebac be fgace dfebagc
+cdfegba eafdc afcgb abcfge bfgd cfagbd adg dcafg cebdga gd | adbecfg cfagb dabgce cafbg
+geaf fg acbgd fgd dgfcbae dbaef fgbda ebgdfa egfcbd acefbd | gcdba edfbgc ebcadf gf
+cbgfe egac ce ecf bgfeca cbdgf fgbdea fbgceda geafb eafdcb | gecbaf adebcf efc ecf
+fcd gfbcd dfbge dc gcbefad dcag afebdc gfbac efabgc fadbcg | bgdfc bcfga bfgdc cd
+dg dgeb acedbg bdfagc faceg cfagdbe ebadc daceg afbdce cdg | gdaec afgec gcd eacdb
+badeg dfegab efgadcb ad fgcdbe egbdf gcdeaf gad dafb bgcea | dgaeb bgdfe agdbe fbaged
+deag ea gabedcf decfb dcfea fcdgae fgcda dgcfab cegabf fae | dcagfbe gafcde fedbc fdbacg
+eacfg bged cgdafb dg cegad dgcbea bceadf adg gbdfcea baedc | bcfadg gcfae gbed eabdgc
+efdba cegafb bcgdfae gdabe cefbd aef af ebgcdf ebdcfa facd | fdabec gfbeca fea adfc
+ab fdeba cgefbd fdgae bea fbdce bdafce egfacb ecbdagf dabc | eba gdafe bdaef gfbeca
+feadcb dgfabec gdafb cb ebgc fdcgbe cagefd dfgcb fgedc bcd | gfcde gdcfb fgbced decbfa
+fabcde cae ecbfga agbed fbacg cegf cgdabef dbagfc ce acbeg | gbdea gcebfa fdeabc baceg
+gfebca cageb dbfcaeg ed aecd edg bdegca ebgafd fcbgd gbdec | fbacge dcebg acde edca
+bfgedca ec gacfd gcafbe decb cef gdafeb afebdc efadc dfbea | bdec cfeabd cagfd feadc
--- a/2021/day08/main.go
+++ b/2021/day08/main.go
@ -0,0 +1,274 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	solve(inp)
+}
+
+func solve(inp []string) {
+	var segments []seg
+	for i := range inp {
+		pts := strings.Split(inp[i], "|")
+		var patterns [][]byte
+		for _, v := range strings.Fields(pts[0]) {
+			patterns = append(patterns, []byte(v))
+		}
+		var output [][]byte
+		for _, v := range strings.Fields(pts[1]) {
+			output = append(output, []byte(v))
+		}
+		segments = append(segments, DeduceSeg(patterns, output))
+	}
+
+	var c1, c4, c7, c8 int
+	var total int
+	for i := range segments {
+		c1 += segments[i].instances(1)
+		c4 += segments[i].instances(4)
+		c7 += segments[i].instances(7)
+		c8 += segments[i].instances(8)
+		total += segments[i].value()
+	}
+
+	fmt.Println("# Part 1")
+	fmt.Println("1,4,7,8 appear", c1+c4+c7+c8, "times")
+	fmt.Println("")
+	fmt.Println("# Part 2")
+	fmt.Println("Total", total)
+}
+
+type seg struct {
+	N, NE, SE, S, SW, NW, C                                    byte
+	Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine []byte
+	Output                                                     []int
+}
+
+func DeduceSeg(pInput, oInput [][]byte) seg {
+	segments := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
+	// 0, 3, 5, 9
+	var patterns [][]byte
+	for _, p := range pInput {
+		sort.Slice(p, func(i int, j int) bool { return p[i] < p[j] })
+		patterns = append(patterns, p)
+	}
+	var output [][]byte
+	for _, o := range oInput {
+		sort.Slice(o, func(i int, j int) bool { return o[i] < o[j] })
+		output = append(output, o)
+	}
+	var removeFromSegments = func(v ...byte) {
+		for k := range v {
+			rem := -1
+			for b := range segments {
+				if segments[b] == v[k] {
+					rem = b
+				}
+			}
+			if rem > -1 {
+				segments = append(segments[:rem], segments[rem+1:]...)
+			}
+		}
+	}
+	var removeFromPatterns = func(v ...[]byte) {
+		for k := range v {
+			rem := -1
+			for i := range patterns {
+				if string(patterns[i]) == string(v[k]) {
+					rem = i
+				}
+			}
+			if rem > -1 {
+				patterns = append(patterns[:rem], patterns[rem+1:]...)
+			}
+		}
+	}
+	s := seg{
+		N:  '-',
+		NE: '-',
+		SE: '-',
+		S:  '-',
+		SW: '-',
+		NW: '-',
+		C:  '-',
+	}
+	for i := range patterns {
+		switch {
+		case len(patterns[i]) == 2:
+			s.One = patterns[i]
+		case len(patterns[i]) == 4:
+			s.Four = patterns[i]
+		case len(patterns[i]) == 3:
+			s.Seven = patterns[i]
+		case len(patterns[i]) == 7:
+			s.Eight = patterns[i]
+		}
+	}
+	removeFromPatterns(s.One, s.Four, s.Seven, s.Eight)
+
+	//First, we know the N segment, it's what shows up in 'seven' , but not in 'one'
+	for i := range s.Seven {
+		if bytes.IndexByte(s.One, s.Seven[i]) == -1 {
+			s.N = s.Seven[i]
+			removeFromSegments(s.N)
+			break
+		}
+	}
+
+	// Six length numbers:
+	// 0, 9, 6
+	// We know that 'seven' is inside of 'nine' and 'zero' but not 'six'
+	for _, p := range patterns {
+		if len(p) == 6 {
+			for _, v := range s.Seven {
+				if bytes.IndexByte(p, v) == -1 {
+					// 'v' also has to be the NE segment
+					s.NE = v
+					removeFromSegments(s.NE)
+					s.Six = p
+					break
+				}
+			}
+		}
+	}
+	removeFromPatterns(s.Six)
+
+	for _, v := range s.Seven {
+		if v != s.N && v != s.NE {
+			s.SE = v
+			removeFromSegments(s.SE)
+		}
+	}
+
+	// Five length numbers: 2, 3, 5
+	// Two is missing the SE segment
+	// Five is missing the NE segment
+	for _, p := range patterns {
+		if len(p) == 5 {
+			if bytes.IndexByte(p, s.SE) == -1 {
+				s.Two = p
+			}
+			if bytes.IndexByte(p, s.NE) == -1 {
+				s.Five = p
+			}
+		}
+	}
+	removeFromPatterns(s.Two, s.Five)
+
+	// The remaining 5 length is Three
+	for _, p := range patterns {
+		if len(p) == 5 {
+			s.Three = p
+			break
+		}
+	}
+	removeFromPatterns(s.Three)
+
+	// Nine is the same as Five except for NE
+	for _, p := range patterns {
+		for _, b := range p {
+			if b != s.NE && bytes.IndexByte(s.Five, b) == -1 {
+				s.Zero = p
+				break
+			}
+		}
+	}
+	removeFromPatterns(s.Zero)
+	s.Nine = patterns[0]
+
+	// NW is the non-SE that is missing from Two
+	for _, b := range segments {
+		if b != s.SE && bytes.IndexByte(s.Two, b) == -1 {
+			s.NW = b
+			removeFromSegments(s.NW)
+			break
+		}
+	}
+	// SW is the segment in Six that's not in Five
+	for _, b := range segments {
+		if bytes.IndexByte(s.Five, b) == -1 && bytes.IndexByte(s.Six, b) != -1 {
+			s.SW = b
+			removeFromSegments(s.SW)
+		}
+	}
+	// C is the remaining segment in Four that's not in 0
+	for _, b := range segments {
+		if bytes.IndexByte(s.Zero, b) == -1 && bytes.IndexByte(s.Four, b) != -1 {
+			s.C = b
+			removeFromSegments(s.C)
+		}
+	}
+	// The last segment is S
+	s.S = segments[0]
+
+	// Now fill in the outputs
+	for i := range output {
+		s.Output = append(s.Output, s.valueOf(output[i]))
+	}
+
+	return s
+}
+
+func (s seg) instances(v int) int {
+	var t int
+	for _, o := range s.Output {
+		if o == v {
+			t++
+		}
+	}
+	return t
+}
+
+func (s seg) value() int {
+	var retStr string
+	for _, o := range s.Output {
+		retStr = retStr + h.Itoa(o)
+	}
+	return h.Atoi(retStr)
+}
+
+func (s seg) valueOf(b []byte) int {
+	sort.Slice(b, func(i int, j int) bool { return b[i] < b[j] })
+	switch string(b) {
+	case string(s.Zero):
+		return 0
+	case string(s.One):
+		return 1
+	case string(s.Two):
+		return 2
+	case string(s.Three):
+		return 3
+	case string(s.Four):
+		return 4
+	case string(s.Five):
+		return 5
+	case string(s.Six):
+		return 6
+	case string(s.Seven):
+		return 7
+	case string(s.Eight):
+		return 8
+	case string(s.Nine):
+		return 9
+	}
+	return -1
+}
+
+func (s seg) String() string {
+	ret := fmt.Sprintf("%s\n", string([]byte{' ', s.N, s.N, s.N, s.N, ' '}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{s.NW, ' ', ' ', ' ', ' ', s.NE}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{s.NW, ' ', ' ', ' ', ' ', s.NE}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{' ', s.C, s.C, s.C, s.C, ' '}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{s.SW, ' ', ' ', ' ', ' ', s.SE}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{s.SW, ' ', ' ', ' ', ' ', s.SE}))
+	ret = fmt.Sprintf("%s%s\n", ret, string([]byte{' ', s.S, s.S, s.S, s.S, ' '}))
+	return ret
+}
--- a/2021/day08/testinput
+++ b/2021/day08/testinput
@ -0,0 +1,10 @@
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce